Photoelectrochemical properties of FeO-SnO films prepared by Sol-Gel method
Journal of Physical Chemistry C, ISSN: 1932-7447, Vol: 115, Issue: 14, Page: 7050-7055
2011
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Article Description
FeO-SnO coating films of various Sn/(Fe + Sn) mole ratios, r, were prepared by dip-coating on Nesa silica glass substrates from the solutions consisting of Fe(NO) AA9HO, SnClAA5HO, H O, CHCOCHCOCH, and CH OCHOH. The photoanodic properties were studied in a three-electrode cell with an aqueous buffer solution of pH = 7 as the supporting electrolyte. The FeO-SnO films of r = 0-0.25 comprised hematite phase and exhibited photoresponse under the UV and visible light. The photoanodic response of the α-FeO film was enhanced by doping with Sn ; the film of r = 0.1 exhibited the maximum IPCE (incident photon-to-current efficiency) of 26.9% and 8.6% at the wavelengths of 350 and 425 nm, respectively, which were higher than those of the Fe O-TiO film of Ti/(Fe + Ti) = 0.1 prepared by similar process. IPCE decreased with increasing r from 0.1 to 0.25. The films of r ≥ 0.5 comprised rutile phase without hematite phase, showing very low IPCE. © 2011 American Chemical Society.
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